My (20f) mom (60) was diagnosed a couple days ago and I don’t know what to

Hopefully all this makes sense, I’ve never used Reddit before but I just need to get all this out:

My mom was just diagnosed with stage 4 cancer in her large intestine, it took me a bit to realize that meant colon cancer. I just learnt of this diagnosis on the 11th as I was taking my finals, I love my mom but she’s always had the worst timing telling me about bad things & even knowing this I was still so distraught. She’s been positive about the whole thing when speaking about it & says how she feels fine and she’s not just gonna die immediately. She told me about how the drs were also optimistic, & I’m still a little confused on everything but they said there was only tumor on her large intestine, so it’s hasn’t spread to any part of her body yet.

She just went in for surgery to get a port today, and will be starting chemo soon, I’m so terrified by the idea of her getting worse. It’s physically made me sick, i can’t eat, nor stop crying and I’m just riddled with anxiety. I’m trying to stay positive and not think sm but it’s hard, she’s genuinely all I have, my father passed away from cirrhosis back in 2021 and this is around the same time that he was also sick. I watched him get worse, and my mom’s diagnosis has brought up memories of that. I really just need some reassurance as my siblings are just so awkward and pessimistic about the situation, which means I’m most likely the one who will be responsible for everything and that’s a lot of pressure. I feel so alone & have so much questions. I just love her with all my heart, I want her to get better, any advice on how to best help her, besides giving her a bunch of affection, would be very appreciated. (Ie: how she should eat, if pets are ok near her etc..,)

Edit: thank you to everyone who replied I appreciate it so much, I mentioned in the thread but I did find out she’s stage 3b idk if maybe my mom got confused hearing everything at the hospital but I looked at her mychart & so far it’s only spread to her lymph nodes. My anxiety ik will be bad but I’m feeling more confident I can care for her, she had the port put in and she’s still feeling good, I’ll be joining colontown too to look for some more info.